We were there 2 weeks ago and you could not sign up until the park opened. Also, all children who want to participate must be there. They talk to the kids a bit to make sure they are ok with strangers, etc. before letting them sign up. When I brought the kids over at the time they told us to gather (about 30 minutes before showtime), a woman was trying to get her kids in and she was MAD when they told her that all the spots for the day were gone.